Stay bolt



J. F. L. BAKER.

STAY BOLT.

APPLICATION FILED APR.25. I921.

1,4:1 1 ,261 Pa tented Apr. 4, 1922.

"f" 1 w ,4 ,vzzw v INVENTOR 12 1777' .3 g 5 9 v A Worms! TEs UNITED STAPATENT, OFFICE.

JOHN L. BAKER, or saemawpnrcineam assmnoa 'ro THE wroic as 301mm:COMPANY; or- SAGINAW; MICHIGAN, a'coaronarxon or nronream STAY am. I Y

I Application filed A pfll 25,

To a-ll'whom it mwy'concern: I

Be it known that'I, JOHNF. L. BAKER, a" citizen of the United States,residing at Saginaw, in the county of'Saginaw and State of Michigan,have invented certain new and usefullinprovements in Stay Bolts; and Ido hereby declare the following to be a full, clear, and exact"description of the invention, such as will enable others skilled'in theart to which itappertains to make and use the same. i 1' This inventionrelates to stay-bolts and pertains more particularly to boilerstay boltsadapted for reinforcing fiat surfaces such as the plates that form thewalls of the steam andwater legs of watertube boilers.

An object of my invention is to provide a stay-bolt so constructed. thatit can be quickly and easilyxapplied'to the plates of a boiler withoutthe necessity of 'in'ternally screw-threading the stay-bolt holes thatreceive the threaded stay-bolts heretofore em- Another'object is toprovide astayebolt so constructed that the greater the" pressure tendingto separate the platesgthe. greater will be the gripping'ortightening'action of thestay-bolt on therespective plates.

A further objectis'to provide tapered or conical joints between thestay-bolt and both 'plates, the tapers in the opposing plates being inopposite directions and the stay-bolt adapted to be readily assembled inplace in the oppositely tapered openings of the two lates. 1

A still further. object is to provide a cornpressible tapered ringadapted to surround one end of the stay-bolt and fitting between thestay-bolt and the tapered orifice in the plate, the compressible ringadapted to be forced into place and heldby the stay-bolt nut, the ringforming a tapered and compressed joint betweenthe stay-bolt and thewalls of the tapered opening in the plate. 1

lVith the foregoing and certain other ohjects in view which will appearlater in the specification, my invention comprises the devices describedand claimed and the equivalents thereof.

My invention is illustrated in the accompanying drawings, in which Fig.1 is a part sectional view of, a stay-bolt according to my improvedconstruction, thebolt being shown applied to the leg of a water tubeboiler. I

r span-1am of m sme- Patented A r..4,"1922.

1921. Serial No; 4e4,39 o.

Fig. 2 is Ian enlarged sectional view of the compressible conical-ringshown in Fig; 1.

' Fig." 3 is afragmentar'y sectional view; showing the stay-bolt nutand'compr'essible ring in their tightened positions.

As-is'clearly shown in the drawings, the device consists in thestay-bolt body 1 formed with an enlarged turned part 2, preferablycylindrical or approximately cylindrical. The end 3 o-f'thebody'near theturned part 2-is threaded. The end 40f the stay-bolt, which in practiceis the end inside the'boiler, and which I term the-inner end of thebolt, is enlarged and tapered and may, if desired, be forme'd'withan'enlarged'head 5.

6 represents the inner plate or sheet of a boilerfas for example,,tlietube plate of the water leg ofa water tubeb'oiler, and 7 isftheouterplate. fThe' space between the sheets '6 and I may represent any spaceunder pressure, as fo'r instanceafw'ater spacei'o'r asteamsp'ace of theboilerf.' "'8 is a threaded nut and9'is a tubular thimble or'spacer thatV separates the sheets 6 and 7 againstthe te'n' sionof th'e bolt1*whenthe nut 8' is tightened." T The tapered end t of the stay-boltfitsa correspondinglytapered aperture drilled and J ream-ed: in theplate 6. The ngle of. th taper preferably corresponds to what is knownas a No. 5 Morse taper.

The cylindrical enlarged part 2 of the i stay-bolt enters {an opening10, drilled.

the large end of the ring, whereby an annu,

lar clearance space is left between the outer rim of the ring and theinner tapered wall of the opening 11 in the plate, as indicated by theprojected dotted line 14 of Fig. 2. This clearance spacepermits the ringwhen forced by nut 8 into the -V-shaped annular space between thetapered wall 11, and the cylindrical part 2' of the stay-bolt, to spreadand completely fill the clearance space. Nut 8, while compressing thering, 1s screwed down from its clearance positionof Fig.5

1 to its tightened position-, Fig; 3. The bolt may be drilledlongitudinally at its outer end as shown bythe dottedlines l11-Flg. 1,to form an opening for the escape of vwater or steamin case theboltvbreaks. This opening is commonly spec fied in standard boiler codesas a required feature of v staybolt construction.

The stay-bolt assembly made by first placing the thimble 9 to registerwith the tapered openings of plates 6 and 7, then passing the stay-boltthrough the opening of plate6 until the enlarged tapered end 4 fits intothe tapered opening offplateG.

'The enlarged cylindrical part 2 of the staybolt'is then within theopening 11 of plate 7. The tapered end 4 otthe bolt mayithen be ti htlyseated in the conical opening of g p ate .6 by driving with a sledgeupon head 5 The tapered ring 12 is then slipped over the end f the boltand entered, as shown in F ig. 1, in the annular'tapered space hetween.the wall of'the opening 11 and the rim oi the enlarged part 2 of thestay-bolt. The nut S-isthentightened untilit seatson plate'TQQInseating, the nut; squeezes the compressible metal of, the ring, causingthe metal to f fill theclearance at 13, and form afl'co'mpaet annularwedge thatdserves' the same purpose as the tapered part 4 of the avingthus described my inventio'mwhat I claim and" desire to secure byLetters Patent is:'

' t 1; A stay-bolt "comprising a a 1 body formed an enlarged taperedendand a threaded end, a substantially cylindrical enlarged member on saidbolt adjacent said threaded end, an exteriorly tapered ring adapted toreceive said en arged member,

and a nut on said thre'adedend adapted to 1 2. A stay-bolt -"-comprisinga bolt body' cn a e said rin z, I

C b D formed with an enlarged tapered end and'a Y threaded end, asubstantially cylindrical enlarged meniber'on said bolt adjacent saidthreaded end, an exteriorlytapered ring of compressible materialadapted-t0 receive said v enlarged member-andanut on said threadedendadapted to engage the end of said compressible ring, for the purposesset forth.

3. In combinatioma pair of plates having oppositely tapered openings,athimble'between said plates, a stay-bolt body formed with an enlargedtapered end fitting the tapered opening of one 'of said plates', the

enlarged member, and a nut on the threaded end of said bolt, adaptedtoengage the end of said compressible ring. Y I p I A A stay-boltincludinga bolt; body havng a threadedend, a substantially;cylindri- I 'calenlarged member on saidbolt adjacent said threaded end, an exteriorly"tapered ring vof compressible material receiVedj-on.

said enlarged memberpand anutonflsaid threadedlend adapted to engagesaid ring. V I n'testimony whereof, I afiix my signature,

' JOHN F; L. BAKER,

